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last_read
2004 Apr 06
1
Ignorant lack of bliss : summarise table by column attribute
...ople in relation to the trend of their previous performance.
I am neither a mathematician or a statistician, but wondered if R (which
I have been using as a desktop calculator!) and some knowledge from this
list may be able to help.
We have a dataset something like this:
group | previousavg | lastreading | finalreading
------------------------------------------------
1 | 9.5 | 10 | 12
1 | 7 | 9 | 11
1 | 12 | 11 | 12
2 | 13 | 14 | 16
2 | 11 | 10 | 9
3 | 10...